JPH03242886A - Method for molding floppy shell - Google Patents

Abstract

PURPOSE:To simplify an assembling line and to expand molding conditions by molding an upper shell and a lower shell integrally through a hinge. CONSTITUTION:A hinge part 4a to join an upper shell 1 and a lower shell 2 is molded integrally with the upper and lower shells 1 and 2 at two places in a side part neighborhood and a gate 4 is provided on the position of the hinge part 3a in the vicinity of the side part. That is, the gate part 4 is located at the side edge part of a shell molding article when the shells are folded by providing the gate 4 at the hinge part 3a. Thus, transporting and assembling lines are simplified and a molding conditions as an integrated body to the upper shell 1 and the lower shell 2 is expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for molding a floppy shell.

(Prior Art) A floppy shell is composed of an upper shell and a lower shell, and the upper shell and the lower shell are each molded in separate molds, or are molded in sets using two molds.

In the case of a set, they are taken out separately from the mold, assembled with other parts on an assembly line, and then welded together to complete the finished product. For this reason, separate lines for the upper shell and lower shell were initially required, and the lines were complicated due to positioning for the combination.

In addition, both the upper shell and the lower shell have high requirements for appearance and dimensional accuracy, and are difficult to mold because they are thin-walled molded products, and extremely advanced technology is required to suppress the occurrence of cracks. Particularly advanced molding technology and mold precision were required when making sets.

In addition, the gates of the floppy shell are located at all four locations a" d in Figures 8 and 9, or a and b, or C and d.
These two locations are common, but in any case, the marks of the gate holes will remain on the finished product and spoil the appearance. Moreover, since the positions a and b are the surfaces on which the shutter of the recording window slides, there are many inconveniences such as gate protrusion is not allowed.

(Problems to be Solved by the Invention) In view of the problems of the prior art, it is an object of the present invention to provide a molding method that can simplify the floppy shell assembly line and expand the molding conditions.

(Means for solving the problem) The upper shell and lower shell are integrally molded via a hinge.

In addition, the gate position is a hinge part so as not to spoil the appearance.

(Example) In the first construction drawing, 1 is an upper shell and 2 is a lower shell. 3a is a hinge part that connects the upper shell ■ and the lower shell 2, and the upper and lower shells 1,
2 is integrally molded.

FIG. 2 shows another example of a floppy shell, in which a hinge portion 3b is integrally molded near the side, similar to the example of FIG.

FIG. 3 shows yet another example, in which a continuous long hinge portion 3c is integrally provided except for the side portions of the upper and lower shells 1, 2. FIG. 4 is a perspective view of this example.

5 and 6 are perspective views of the floppy shell of FIG. 3, with FIG. 5 showing the floppy shell in the unfolded state and FIG. 6 showing the floppy shell in the folded state. In the case where the hinge portion 3c is long, a gate 4 is provided on the hinge portion 3c. This configuration eliminates the need to provide gate portions on the surfaces of the upper and lower shells 1 and 2.

FIG. 7 is a perspective view of the floppy shell shown in FIG. 1, and in this case also, a gate 4 is provided at the position of the hinge portion 3a near the side.

As explained above, by providing the gate in the hinge portion, the gate portion is located at the side end portion of the shell molded product when the shell is folded, as shown in FIG.

(Effects) 1) Since the upper shell 1 and the lower shell 2 are integrally molded through the hinge portion, the transportation and assembly line is simplified.

2) Since it is an integrally molded product, bosses for positioning and fitting the upper shell 1 and lower shell 2 are not required, or the number of bosses can be reduced, making it possible to simplify the design of the mold and molded product. becomes.

3) Since it is sufficient to set the molding conditions for the upper shell 1 and lower shell 2 as an integral body, there is an advantage that the conditions can be expanded.

Incidentally, when compared to a set mold, if the upper shell is too crisp and the lower shell is too sinky, fine adjustment of the gate balance and conditions will be required, but if it is a one-piece mold, it can be done at this stage. They cancel each other out, resulting in a quality product.

4) Also, since the gate 1- is provided at the hinge part, the resin coming in from the gate passes through the orifice called the hinge, so the radial flow from the gate is rectified, resulting in a film gate suitable for forming plate objects. This makes it easier to create molding conditions that prevent sink marks and warpage.

[Brief explanation of drawings]

1 to 3 are plan views of an upper shell and a lower shell integrally molded at a hinge portion. FIG. 4 is a perspective view of the floppy shell of FIG. 3. FIG. 5 shows the gate position of the floppy disk as shown in FIG. FIG. 6 shows the floppy shell of FIG. 5 in a folded state. FIG. 7 shows the gate position of the floppy shell of FIG. Figures 8 and 9 are explanatory diagrams of the gate positions of the known upper shell and lower shell. In the figure; 1 upper shell 2 lower shell 3a, 3b, 3
c Hinge part 4 gates or more

Claims (2)

[Claims] (1) A method for molding a floppy shell, characterized in that an upper shell and a lower shell are integrally molded via a hinge. (2) The method for molding a floppy shell according to claim (1), wherein the gate position is a hinge portion.